[PATCH] board: spacemit: k1: accept the "m1-x_" TLV product name prefix

board_fit_config_name_match() derives the device tree name from the TLV
product name held in the board EEPROM, and only recognises boards whose
product name starts with "k1-x_".

Boards fitted with the higher-binned M1 part report an "m1-x_" prefix
instead.  On those, fdt_name is left empty and the function silently
falls back to "k1-musepi-pro", so an M1 board selects the wrong device
tree with no error or warning.

A Milk-V Jupiter fitted with an M1 reads, from the 24c04 at i2c2 0x50:

  00: 54 6c 76 49 6e 66 6f 00 01 00 1a 21 12 6d 31 2d  TlvInfo....!.m1-
  10: 78 5f 6d 69 6c 6b 76 2d 6a 75 70 69 74 65 72 fe  x_milkv-jupiter.

i.e. TLV code 0x21 (product name), length 0x12, "m1-x_milkv-jupiter".

The device trees are named for the K1 in both cases, so accept either
prefix and keep deriving a "k1-" name.

Signed-off-by: Bruno Banelli <[email protected]>
---
 board/spacemit/k1/spl.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/board/spacemit/k1/spl.c b/board/spacemit/k1/spl.c
index d749e21a..e82fad23 100644
--- a/board/spacemit/k1/spl.c
+++ b/board/spacemit/k1/spl.c
@@ -367,7 +367,14 @@ int board_fit_config_name_match(const char *name)
 	int i;
 
 	memset(fdt_name, 0, I2C_BUF_SIZE);
-	if (!strncmp(product_name, "k1-x_", 5)) {
+	/*
+	 * The TLV product name is prefixed with the SoC variant fitted to
+	 * the board: "k1-x_" for a K1, "m1-x_" for the higher-binned M1.
+	 * Device trees are named for the K1 in both cases, so accept
+	 * either prefix and always derive a "k1-" name from it.
+	 */
+	if (!strncmp(product_name, "k1-x_", 5) ||
+	    !strncmp(product_name, "m1-x_", 5)) {
 		snprintf(fdt_name, I2C_BUF_SIZE, "%s-%s", "k1",
 			 &product_name[5]);
 	}

base-commit: 964ad5b5c91b7be56e443e899d7f873e6aa8c9fc
-- 
2.43.0